<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>box盒子模型</title>
	<style>
	#one{
		background-color: yellow;
		width:300px;
		height:300px;
		border-width:20px;
		border-right-color: red;
		
	}

	#two{
		background-color: red;
		width: 300px;
		height: 300px;
		padding: 20px;
		margin: 50px 50px;
	}

	#three{
		background-color: blue;
		width: 300px;
		height: 300px;
		/*display: block;*/
	}

	</style>
</head>
<body>
	<div id="one"></div>
	<div id="two"></div>
	<div id="three"></div>
</body>
</html>